Sierra Synthetic Blend Marine Engine Oil

Sierra Synthetic Blend Marine Engine Oil is a 4-cycle (4-stroke) marine engine oil made for sterndrive and inboard boat engines. It combines premium synthetic and mineral base stocks with additives designed for the stress of marine operation. It is also sold as a synthetic blend 25W-40 boat motor oil.

Key Features:

• NMMA FC-W certified and API-SL rated for marine 4-stroke service
• Synthetic blend formula in a 25W-40 viscosity grade
• Meets the needs of modern recreational 4-stroke engines, with or without emission catalyst systems
• ZDDP anti-wear additive technology helps prevent phosphorus depletion and extend emission catalyst life
• Helps minimize corrosion that forms inside the engine
• Detergent and dispersant additives help suspend contaminants and prevent sludge formation
• Wear protection and deposit control for internal engine components
• Resists excessive thinning under high RPM, high temperatures and heavy loads

Sierra is a well-known marine parts brand. This oil is a dependable choice for routine oil changes and seasonal maintenance, and it helps protect engines through demanding time on the water.